// Copyright 2025 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package inspectionmetadata

import "github.com/GoogleCloudPlatform/khi/pkg/common/typedmap"

type MetadataLabelOpt interface {
	Write(labels *typedmap.TypedMap)
}

// Construct the LabelSet with required fields.
func NewLabelSet(labelOpts ...MetadataLabelOpt) *typedmap.ReadonlyTypedMap {
	typedMap := typedmap.NewTypedMap()
	for _, lo := range labelOpts {
		lo.Write(typedMap)
	}
	return typedMap.AsReadonly()
}

// labelValueOpt stores a label value associating to a label key.
type labelValueOpt[T any] struct {
	labelKey MetadataLabelsKey[T]
	value    T
}

// Write implements MetadataLabelOpt interface
func (o *labelValueOpt[T]) Write(labels *typedmap.TypedMap) {
	typedmap.Set(labels, o.labelKey, o.value)
}

// WithLabelValue creates a MetadataLabelOpt to store a single value associated to a label key.
func WithLabelValue[T any](labelKey MetadataLabelsKey[T], value T) MetadataLabelOpt {
	return &labelValueOpt[T]{
		labelKey: labelKey,
		value:    value,
	}
}
